Lamp-house for projecting apparatus.



E. E. MAGGARD..

LAMP HOUSE FOR PROJECTING APPARATUS.

APPLICATION FILED mzc.19.1913.

1 ,1 92,658. Patented July 25, 1916.

/ woe/wt ELISHA E. MAGGARD, 0F HOREHEAD, KENTUCKY.

LAMP-HOUSE FOR PROJECTING APPARATUS.

Specification of Letters Patent.

Patented July 25, 1916.

Application filed December 19, 1913. Serial No. 807,754.

To all whom it may concern Beit known that I, ELISHA E. MA GARD, a citizen of the United'States, residing at Morehead, in the county of Rowan and State of Kentucky, have invented new and useful Improvements in Lamp-Houses for Projecting Apparatus, of which the following is a specification. p I

The invention relates to lamp houses for projecting apparatus, and more particularl to lamp houses for use in connection with motion picture machines, and has for an object to provide a lamp house of a simple construction which will permit of readily adjusting the usual carbons or electrodes and which, furthermore, isso arranged and constructed that itcan be readily cleaned.

The invention contemplates, among other features, the provision of a lamp house adapted to contain the usual carbons and which, by means of suitable mechanism, can be conveniently adjusted, so that a uniform light can be produced when the lamp house is used in connection with projecting apparatus such a motion picture machines and the like.

A still further embodiment of the invention resides in a structure so arranged and constructed that it can be readily opened for the purpose of cleaning the interior thereof and also for the purpose of removing broken or used pieces of carbons.

In the further disclosure of the invention reference is to be had to the accompanying drawings, constituting a part of this specification, in which similar characters of reference denotecorresponding parts in all the views, and in which:

Figure 1 is a fragmentary perspectiv view looking at the rear of 'the lamp house;

Fig. 2 is a vertical longitudinal sectional view taken through the lamp house; and Fig. 3 is a vertical transverse sectional View showing the mechanism for operating the carbons.

Referring more particularly to the views,

I disclose a base 10 supporting a casing 11 constituting the body of the lamp house and which is provided with the usual condenser lenses 12. Mounted to swing on the rear end of the casing is a substantially semispherical closure 13 adapted to normally close the. casing and secured by a suitable.

catch (not shown). A block 14 preferably made of porcelain is secured to the outer curved face of the closure 13 by means of suitable'screws 15 and journaled in the block is a shaft 16, on which is keyed a toothed wheel 17, the said shaft having one end projecting exteriorly of the box and having a knurled operating wheel 18 whereby rotation can be imparted to the toothed wheel 17. A second shaft 19 isjou'rnaled in the block 14 and keyed thereon is a toothed wheel 20 preferably having a hub portion 21 thereof formed of some insulating mate rial, with the toothed wheel 20 in mesh with the toothed wheel 17.

Mounted to slide in the block and extending through suitable apertures in the closure 13 are carbons 22, 23, which converge toward, their inner ends and at which point the light is adapted to be produced. Keyed on the shaft 16 is a serrated wheel 24: engaging the carbon 22 andikeyed upon the shaft 19 is a serrated wheel 25 engaging the carbon 23. Now it will be apparent that by turning the member 18, rotation will be imparted to the toothed Wheel 17 thus also rotating the toothed wheel 20 and thusthrough the medium'of the shafts 16 and 19 imparting a rotation to the wheels 24, 25, whereby the carbons 23,22 can be relatively advanced or retreated within the casing 11 and simultaneously operated.

Spring-like contact members 26, 27 are secured within the block 14 and bear against the carbons 22 and 23 respectively, thus not only holding the carbons in frictional en gagement with the serrated wheels 24, 25, but also constituting the means for conveyingtheelectric current for illuminating purposes, to the carbons by means of suitable wires 28, 29 respectively, connecting with the respective contact members 26 and 27 and leading to the source 'ofele'ctric energy.

Now from the foregoing description it will be seen that the carbons are relatively insulated by being arranged in the porcelain block 14 as mentioned, and can be readily adjusted from the exterior of the casing.

Should the carbons become worn out or 7 broken, the closure 13 can be readily swung into open position so that the operator can easily have access to those portions of the carbons which normally lie in the casing for the purpose of removing the broken or worn out carbons, and with this construction the vergent relation to eachother for projection through the closure into the lamp house, 5 feed wheels mounted on the axlesand engaging the carbons to move the same, and a hand knob mounted on the end of one of the axles exteriorly of the block.

In testimony whereof I aflix my signature 20 in presence of two witnesses ELISHA MAGGARD.

\Vitnesses:

CHARLES E. XVEBER, THERESA M. SILBER. 

